The window depicts Saint Marcellin Champagnat, who founded the Marist Brothers order in France in 1817.

Brother Peter Carroll said it was created by one of Australia's most eminent stained glass artists, Kevin Little.

"Kevin has been responsible for all the other stained glass windows that have gone into the cathedral in the last 10 years. I don't think you would find a better example of stained glass in the country," he said.

Trinity Catholic College teacher Narissa Phelps has also written a book marking Trinity College's jubilee year.

"We have been donated photos by the community and we accessed the Marist Brothers archives in Sydney as well as the diocesan archives and the Richmond River Historical Archives," she said.

Many of the school's photographs were lost because of flooding, but Ms Phelps said she found some "magnificent" photos taken by the Presentation Sisters in the 1880s.

"The first photograph is dated 1888 which is very early in the history of photography so the sisters were really pioneers in capturing a history of what they were doing," she said.

Bro Carroll said he hoped brothers and past students will return to Lismore for this weekend's celebrations.

"We've had a lot of brothers who have worked in the diocese over the years and some of them will be returning for the celebrations because Lismore has a very special place in the history of the brothers," he said.

Call 6627 6600 for details or tickets.

About the celebrations

The jubilee book will be launched during a dinner at 6:30pm on Saturday at the Trinity Sports Centre.

The window will be blessed during mass at St Carthage's Cathedral on Sunday from 9am followed by morning tea.

The Trinity Cup horse race will be held from midday on Sunday at the Lismore Turf Club. Marquees are available for $60/person (includes, entry, lunch and drink tickets)